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(No Model.) 1 2 Sheets-Sheet 2. J. THURELL. FURNACE GRATE Patented Mar.29, 1898.

(5 19 1 7II ll z yr i UNITED STATES P TENT OFFlCE.

JOHN THURELL, OF NORTH ADAMS, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TOJAMES B. KEANY, OF SAME PLACE.

FU RNACE-G RATE.

SPECIFICATION forming part of Letters Patent No. 601,601, dated March29, 1898.

I Application filed April 10, 1897- Serial No. 631,681. (No model.)

To all whom it may concern.-

Be it known that I, JOHN THURELL, a citizen of the United States,residing at North Adams, in the county of Berkshire and State ofMassachusetts, have invented new and useful Improvements inFurnace-Grates, of which the following is a specification.

This invention has for its object to provide a furnace-grate comprisingrocking or oscillating grate-bars wherein the lugs with which theshaking-rods connect can be conveniently and quickly adjusted before orafter the grate-bars are mounted in their supportingframe for thepurpose of enabling the grate to be set by an inexperienced person andto enable the central grate-bars, if they should burn where the fire ishottest, to be reversed or turned end for end and placed in correctoperative connection with the shaking-rods.

To accomplish this object my invention consists in the features ofconstruction and in the combination or arrangement of parts hereinafterdescribed and claimed, reference being made to the accompanyingdrawings, in which Figure 1 is a plan view, on a reduced scale, of afurnace-grate embodying my invention. Fig. 2 is a detail verticalsectional view on a larger scale, taken on the line 2 2, Fig. 1, thegrate-bars being in normal position. Fig. 3 is a similar view indicatingby dotted lines the position of the parts when rocked in one direction.Fig. 42 is a similar view indicating the position of the parts whenrocked in the opposite direction. Fig. 5 is a detail perspective view,on a small scale, of the rectangular or square frame by which therocking or oscillating grate-bars are supported; and Fig. 6 is a detailperspective view of the gratebars.

In order to enable those skilled in the art to make and use myinvention, Iwill now describe the same in detail, referring to thedrawings, wherein the numerals 1, 2, 3, and 4 indicate the verticalwalls of a rectangular or square metal frame designed to be set into abrickwork or other furnace structure for the purpose of supporting therocking or oscillating grate-bars, hereinafter described in detail. Therectangular or square frame is an integral casting, having at each oneof its four corners a laterally-projecting flange 5, each designed tofit into a recess in the furnace structure for the purpose of supportingthe frame in proper position. The frame is also cast integral with acentral longitudinal I division-plate 6.

,The rocking or oscillating grate-bars 7 are arranged in two sections atopposite sides of the division-plate 6, and each bar is provided at itsends with trunnions 8, those at the outer ends being seated in bearingsin the side walls 2 and 4 of the rectangular or square frame and thoseat the inner ends being mountedin bearings provided in the top edge ofthe division-plate 6. The grate bars are also each cast integral at thefront and rear with alternating long and short arms or fingers 9 and 10,the short arms or fingers 10 being about one-half the length of the longarms or fingers 9. The extremities of the long and short arms or fingersare formed, respectively, with arc-shaped or beveled edges 12 and 13 attheir under sides, and the long and short arms or fingers of onegrate-bar are in exact alinement with the long and short arms or fingersof' adjacent grate-bars, the construction and arrangement being suchthat the arc-shaped or beveled edges of the alternating arms or fingersof one bar-face oppose and move in close relation to the arc-shaped orbeveled extremities of adjacent grate-bars, whereby the small spacesbetween the extremities of the arms or fingers of one bar and the armsor fingers on the adjacent bars remain invariable and effectuallyprevent coal or fuel dropping through to the ash-pit, particularly whenthe bars are rocked or cscillated. This resultis accomplished in abetter manner by my construction and ar rangement of long and short armsor fingers than is possible with long and short arms or fingers notarranged in alinement in the manner described and shown by me. Theareshaped or beveled extremities of the long and short arms or fingersmay be made tomove very close together to greatly reduce the interveningspaces without any danger whatever of binding or clogging. The uppersurface of each grate-bar is fiat, so that they present a substantiallysmooth fiat grate-bed which can be easily cleaned.

' in each grate-bar, as shown.

wherefore they may be interchanged as to position in the event of thosebars which are arranged at the point of greatest heat becoming burnedout.

The grate-bars of each grate-section are each provided with pendent lugs15, adjustable laterally with relation to the furnace structure orlongitudinally with relation to the grate-bars. justable along the grate-bars by means of bolts, which pass through elongated slots 15 The lugs15 on the grate-bars of each grate-section are piv otally connected to ahorizontal shaker-rod 16, pivoted at its .outer end to a lever 17,whichis pivotally suspended by a pivotal pin 18 from a laterally-adjustablebracket or stud 19. The stud 19 has a part extending through a sl.ot.20in the front wall 1 of the rectangular or square grate-supporting frame.The adjustability of the lugs 15'and pivotally-suspending levers 17renders it possible for an inexperienced person to set the grate and;toy subsequently adjust the lugs and levers as conditions may require.The adjustability' of the lugs and levers is also advantageous in thatif the central grate-bars burn, where the fire is hottest, thesegrate-bars may be reversed or turnedend for end and placed in: operativeconnection with the shaker-rod 16 by simple adjustment of the lugs 15,or the? burned-out jgrate bar or bars may be interchanged with anothergrate bar or bars, as-

before stated.

The integral construction of the rectangu-' lar or square frame,comprising walls 1, 2, 3, and 4 with the lateral flanges '5, materiallycontributesto the convenient and quick set-i ting. of the grate by aninexperienced person.

These pendent lugs are ad-j My inventionprovides a novel and simplefurnace-grate wherein rocking or oscillating grate-bars are eachconstructed at opposite edges with alternating long and short arms orfingers so constructed that when rocked or oscillated the alternatinglong and short arms or fingers will not bind or clog and the smallspaces between the opposing extremities of the arms or fingers 011 onegrate-bar and the arms or fingers on adjacent grate-bars remaininvariable and effectually prevent coal or fuel unduly dropping throughthe grate to the ash-pit.

The invention also provides a novel, simple, efficient, and economicalgrate-supporting frame which greatly facilitates setting the grate andalso enables the shaker mechanism to be conveniently and quickly adusted according as circumstances require or conditions demand. v

Having thus described myinvention, what I claim' is 1. A furnace-gratecomprising a plurality of interchangeable and reversible rockinggrate-bars journ aled in aframe, lugs depend ing from and adjustable insaid grate-bars, a shaker-rod pivotally connected with said :adjustablelugs, an adjustable bracket carried by the frame and an operating-leverpiv- :oted .to said adjustable bracket and to the shaker-rod,substantially as described.

2. A furnace-grate comprising a plurality of interchangeable andreversible grate-bars provided with elongated slots, pendent lugsadjustable in said slots and correspondingly- :adjustable shakermechanism, substantially as described. I

In testimony whereof I have hereunto set 1 'my hand in presence of twosubscribing witnesses.v

. JOHN TI-IURELL. Witnesses:

ED. GUILBo, WM. H. BENNETT.

